(NEK.FASE)
Coined following an argument on a bus to instill fear.
1) A person whom will be experiencing pain, presumably soon, to the face and\or neck.
2) Insult meant to cause the rival or antagonist to fear you while you laugh at them.
see also: neck face

"I am ging to punch you so hard in the face your face is going to go into your neck, and you will be a neckface."